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Weeds can grow through rubber mulch, but it depends on if you removed all the weeds in your garden beforehand. Weeds already in the soil can grow even when using rubber mulch. However, that doesn’t mean that your garden will be littered with rubber and weeds, but it does mean that the occasional weed might still pop up. Another way you can increase your weed suppression is by using landscape fabric as a second layer. 

Gravel’s biggest pro is its cost-effectiveness. For example, a gravel road or driveway is much more affordable than its asphalt counterpart. Gravel is also much less expensive than the cost of pouring a concrete slab if you’re building a patio or similar structure.

However, regarding comfort and convenience, gravel is far less foot-friendly than smoother substances like concrete or asphalt. It’s also more of a challenge to drive on and may kick up dust, resulting in the inevitable need for extra car washes. Lastly, there’s a chance it might move with rain or snow.

The best mulches for trees are wood chips, bark nuggets, or pine straw. Depending on your goals, you may want to avoid using plastic, stone, rubber, or wet grass clippings. Plastic mulch prevents water from reaching the mulched areas of your tree, stones don’t offer any nutritional benefits to the soil, rubber can release byproducts into the soil when it decomposes, and wet grass clippings can lead to rot. 

Plastic may prove beneficial in cold climates in the winter, but wood chips are the ideal option for most environments.

Yes, rubber mulch allows water to seep through and reach the soil underneath. Rubber mulch is not as absorbent as organic mulch, which allows the soil underneath to stay moist and hydrated. Keep in mind that the permeability of rubber mulch can get clogged by landscape fabric and other additional materials.